The function of flux during the smelting of ore is:

to make the ore porous

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to remove gangue

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to facilitate reduction

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to facilitate oxidation

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Solution

The correct option is B to remove gangue
Flux: The substance which is added to remove the gangue from the concentrated ore in its molten state is called flux and the substance formed with flux is called Slag.

Acidic Flux
$S i O_{2} + C a O \to C a S i O_{3}$
Acidic flux removes basic impurities.

Basic Flux
$S i O_{2} + M g O \to M g S i O_{3}$
Basic flux removes acidic impurities.

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